The only high-rise building to have collapsed in the Taiwanese city of Tainan following a major earthquake on Saturday seems to have had serious constructions flaws. The collapse has exposed cooking-oil cans embedded inside the building’s concrete walls.

Witnesses at the scene have told Reuters that they saw large rectangular, commercial cans of cooking-oil packed inside the wall cavities of the 17-story Wei Guan Golden Dragon Building, apparently having been used as building material.

As of Sunday evening the death toll from the 6.7-magnitude earthquake that hit Taiwan at the beginning of the Lunar New Year holiday stands at 33, with 31 of the dead having been found at the collapsed Wei-guan Golden Dragon Building in Tainan.

Cooking oil cans in reinforced pillar of building in Yongkang District exposed after earthquakePhoto: Taipei Times pic.twitter.com/Xw3Fw9750L